667601 has 8 divisors (see below), whose sum is σ = 735264. Its totient is φ = 601120.

The previous prime is 667577. The next prime is 667631. The reversal of 667601 is 106766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667601 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (667631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1286 + ... + 1728.

It is an arithmetic number, because the mean of its divisors is an integer number (91908).

2⁶⁶⁷⁶⁰¹ is an apocalyptic number.

It is an amenable number.

667601 is a deficient number, since it is larger than the sum of its proper divisors (67663).

667601 is a wasteful number, since it uses less digits than its factorization.

667601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 667601 is about 817.0685405766. The cubic root of 667601 is about 87.3988381904.

It can be divided in two parts, 66 and 7601, that added together give a palindrome (7667).

The spelling of 667601 in words is "six hundred sixty-seven thousand, six hundred one".